Category User guide Organisation SNOMED Type Standard Access Open Status Active Created May-25 SNOMED CT is a standard for data elements used in the electronic exchange of clinical information. It can be customised to meet national or local requirements through the use of extensions. This document is a practical guide for extension producers. It presents the purpose, process and principles of creating, distributing and managing SNOMED CT extensions.Main sections:- Purpose- Logical design- Key steps Access Extensions Practical Guide By accessing this content, you are leaving this website. The Agency takes no responsibility for the accuracy of content on the destination page.